188310138 has 8 divisors (see below), whose sum is σ = 376620288. Its totient is φ = 62770044.

The previous prime is 188310127. The next prime is 188310163. The reversal of 188310138 is 831013881.

It is a sphenic number, since it is the product of 3 distinct primes.

188310138 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 188310099 and 188310108.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15692506 + ... + 15692517.

It is an arithmetic number, because the mean of its divisors is an integer number (47077536).

Almost surely, 2^188310138 is an apocalyptic number.

188310138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

188310138 is a wasteful number, since it uses less digits than its factorization.

188310138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31385028.

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 188310138 is about 13722.6141095638. The cubic root of 188310138 is about 573.1802715471.

It can be divided in two parts, 1883 and 10138, that added together give a palindrome (12021).

The spelling of 188310138 in words is "one hundred eighty-eight million, three hundred ten thousand, one hundred thirty-eight".